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openssl/ssl/ssl_conf.c
Viktor Dukhovni 4fa52141b0 Protocol version selection and negotiation rewrite 
The protocol selection code is now consolidated in a few consecutive
short functions in a single file and is table driven.  Protocol-specific
constraints that influence negotiation are moved into the flags
field of the method structure.  The same protocol version constraints
are now applied in all code paths.  It is now much easier to add
new protocol versions without reworking the protocol selection
logic.

In the presence of "holes" in the list of enabled client protocols
we no longer select client protocols below the hole based on a
subset of the constraints and then fail shortly after when it is
found that these don't meet the remaining constraints (suiteb, FIPS,
security level, ...).  Ideally, with the new min/max controls users
will be less likely to create "holes" in the first place.

Reviewed-by: Kurt Roeckx <kurt@openssl.org>
2016-01-02 10:49:06 -05:00

939 lines
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/*
* ! \file ssl/ssl_conf.c \brief SSL configuration functions
*/
/* ====================================================================
* Copyright (c) 2012 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#ifdef REF_CHECK
# include <assert.h>
#endif
#include <stdio.h>
#include "ssl_locl.h"
#include <openssl/conf.h>
#include <openssl/objects.h>
#ifndef OPENSSL_NO_DH
# include <openssl/dh.h>
#endif
/*
* structure holding name tables. This is used for pemitted elements in lists
* such as TLSv1.
*/
typedef struct {
const char *name;
int namelen;
unsigned int name_flags;
unsigned long option_value;
} ssl_flag_tbl;
/* Switch table: use for single command line switches like no_tls2 */
typedef struct {
unsigned long option_value;
unsigned int name_flags;
} ssl_switch_tbl;
/* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
#define SSL_TFLAG_INV 0x1
/* Mask for type of flag referred to */
#define SSL_TFLAG_TYPE_MASK 0xf00
/* Flag is for options */
#define SSL_TFLAG_OPTION 0x000
/* Flag is for cert_flags */
#define SSL_TFLAG_CERT 0x100
/* Flag is for verify mode */
#define SSL_TFLAG_VFY 0x200
/* Option can only be used for clients */
#define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
/* Option can only be used for servers */
#define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
#define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
#define SSL_FLAG_TBL(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
#define SSL_FLAG_TBL_SRV(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
#define SSL_FLAG_TBL_CLI(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
#define SSL_FLAG_TBL_INV(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
#define SSL_FLAG_TBL_SRV_INV(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
#define SSL_FLAG_TBL_CERT(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
#define SSL_FLAG_VFY_CLI(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_CLIENT, flag}
#define SSL_FLAG_VFY_SRV(str, flag) \
{str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_SERVER, flag}
/*
* Opaque structure containing SSL configuration context.
*/
struct ssl_conf_ctx_st {
/*
* Various flags indicating (among other things) which options we will
* recognise.
*/
unsigned int flags;
/* Prefix and length of commands */
char *prefix;
size_t prefixlen;
/* SSL_CTX or SSL structure to perform operations on */
SSL_CTX *ctx;
SSL *ssl;
/* Pointer to SSL or SSL_CTX options field or NULL if none */
uint32_t *poptions;
/* Certificate filenames for each type */
char *cert_filename[SSL_PKEY_NUM];
/* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
uint32_t *pcert_flags;
/* Pointer to SSL or SSL_CTX verify_mode or NULL if none */
uint32_t *pvfy_flags;
/* Pointer to SSL or SSL_CTX min_version field or NULL if none */
int *min_version;
/* Pointer to SSL or SSL_CTX max_version field or NULL if none */
int *max_version;
/* Current flag table being worked on */
const ssl_flag_tbl *tbl;
/* Size of table */
size_t ntbl;
/* Client CA names */
STACK_OF(X509_NAME) *canames;
};
static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
unsigned long option_value, int onoff)
{
uint32_t *pflags;
if (cctx->poptions == NULL)
return;
if (name_flags & SSL_TFLAG_INV)
onoff ^= 1;
switch (name_flags & SSL_TFLAG_TYPE_MASK) {
case SSL_TFLAG_CERT:
pflags = cctx->pcert_flags;
break;
case SSL_TFLAG_VFY:
pflags = cctx->pvfy_flags;
break;
case SSL_TFLAG_OPTION:
pflags = cctx->poptions;
break;
default:
return;
}
if (onoff)
*pflags |= option_value;
else
*pflags &= ~option_value;
}
static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
const char *name, int namelen, int onoff)
{
/* If name not relevant for context skip */
if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
return 0;
if (namelen == -1) {
if (strcmp(tbl->name, name))
return 0;
} else if (tbl->namelen != namelen
|| strncasecmp(tbl->name, name, namelen))
return 0;
ssl_set_option(cctx, tbl->name_flags, tbl->option_value, onoff);
return 1;
}
static int ssl_set_option_list(const char *elem, int len, void *usr)
{
SSL_CONF_CTX *cctx = usr;
size_t i;
const ssl_flag_tbl *tbl;
int onoff = 1;
/*
* len == -1 indicates not being called in list context, just for single
* command line switches, so don't allow +, -.
*/
if (elem == NULL)
return 0;
if (len != -1) {
if (*elem == '+') {
elem++;
len--;
onoff = 1;
} else if (*elem == '-') {
elem++;
len--;
onoff = 0;
}
}
for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
if (ssl_match_option(cctx, tbl, elem, len, onoff))
return 1;
}
return 0;
}
/* Set supported signature algorithms */
static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
{
int rv;
if (cctx->ssl)
rv = SSL_set1_sigalgs_list(cctx->ssl, value);
/* NB: ctx == NULL performs syntax checking only */
else
rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
return rv > 0;
}
/* Set supported client signature algorithms */
static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx,
const char *value)
{
int rv;
if (cctx->ssl)
rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
/* NB: ctx == NULL performs syntax checking only */
else
rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
return rv > 0;
}
static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
{
int rv;
if (cctx->ssl)
rv = SSL_set1_curves_list(cctx->ssl, value);
/* NB: ctx == NULL performs syntax checking only */
else
rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
return rv > 0;
}
#ifndef OPENSSL_NO_EC
/* ECDH temporary parameters */
static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 1;
EC_KEY *ecdh;
int nid;
nid = EC_curve_nist2nid(value);
if (nid == NID_undef)
nid = OBJ_sn2nid(value);
if (nid == 0)
return 0;
ecdh = EC_KEY_new_by_curve_name(nid);
if (!ecdh)
return 0;
if (cctx->ctx)
rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
else if (cctx->ssl)
rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
EC_KEY_free(ecdh);
return rv > 0;
}
#endif
static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 1;
if (cctx->ctx)
rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
if (cctx->ssl)
rv = SSL_set_cipher_list(cctx->ssl, value);
return rv > 0;
}
static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
{
static const ssl_flag_tbl ssl_protocol_list[] = {
SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2),
SSL_FLAG_TBL_INV("DTLSv1", SSL_OP_NO_DTLSv1),
SSL_FLAG_TBL_INV("DTLSv1.2", SSL_OP_NO_DTLSv1_2)
};
cctx->tbl = ssl_protocol_list;
cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
}
/*
* protocol_from_string - converts a protocol version string to a number
*
* Returns -1 on failure or the version on success
*/
static int protocol_from_string(const char *value)
{
struct protocol_versions {
const char *name;
int version;
};
static const struct protocol_versions versions[] = {
{"SSLv3", SSL3_VERSION},
{"TLSv1", TLS1_VERSION},
{"TLSv1.1", TLS1_1_VERSION},
{"TLSv1.2", TLS1_2_VERSION},
{"DTLSv1", DTLS1_VERSION},
{"DTLSv1.2", DTLS1_2_VERSION}};
size_t i;
size_t n = OSSL_NELEM(versions);
for (i = 0; i < n; i++)
if (strcmp(versions[i].name, value) == 0)
return versions[i].version;
return -1;
}
static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
{
int method_version;
int new_version;
if (cctx->ctx != NULL)
method_version = cctx->ctx->method->version;
else if (cctx->ssl != NULL)
method_version = cctx->ssl->ctx->method->version;
else
return 0;
if ((new_version = protocol_from_string(value)) < 0)
return 0;
return ssl_set_version_bound(method_version, new_version, bound);
}
/*
* cmd_MinProtocol - Set min protocol version
* @cctx: config structure to save settings in
* @value: The min protocol version in string form
*
* Returns 1 on success and 0 on failure.
*/
static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
{
return min_max_proto(cctx, value, cctx->min_version);
}
/*
* cmd_MaxProtocol - Set max protocol version
* @cctx: config structure to save settings in
* @value: The max protocol version in string form
*
* Returns 1 on success and 0 on failure.
*/
static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
{
return min_max_proto(cctx, value, cctx->max_version);
}
static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
{
static const ssl_flag_tbl ssl_option_list[] = {
SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
SSL_FLAG_TBL_INV("EmptyFragments",
SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
};
if (value == NULL)
return -3;
cctx->tbl = ssl_option_list;
cctx->ntbl = OSSL_NELEM(ssl_option_list);
return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
}
static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
{
static const ssl_flag_tbl ssl_vfy_list[] = {
SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
SSL_FLAG_VFY_SRV("Require",
SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE)
};
if (value == NULL)
return -3;
cctx->tbl = ssl_vfy_list;
cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
}
static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 1;
CERT *c = NULL;
if (cctx->ctx) {
rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
c = cctx->ctx->cert;
}
if (cctx->ssl) {
rv = SSL_use_certificate_chain_file(cctx->ssl, value);
c = cctx->ssl->cert;
}
if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
OPENSSL_free(*pfilename);
*pfilename = OPENSSL_strdup(value);
if (!*pfilename)
rv = 0;
}
return rv > 0;
}
static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 1;
if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
return -2;
if (cctx->ctx)
rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
if (cctx->ssl)
rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
return rv > 0;
}
static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 1;
if (cctx->ctx)
rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
return rv > 0;
}
static int do_store(SSL_CONF_CTX *cctx,
const char *CAfile, const char *CApath, int verify_store)
{
CERT *cert;
X509_STORE **st;
if (cctx->ctx)
cert = cctx->ctx->cert;
else if (cctx->ssl)
cert = cctx->ssl->cert;
else
return 1;
st = verify_store ? &cert->verify_store : &cert->chain_store;
if (*st == NULL) {
*st = X509_STORE_new();
if (*st == NULL)
return 0;
}
return X509_STORE_load_locations(*st, CAfile, CApath) > 0;
}
static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
{
return do_store(cctx, NULL, value, 0);
}
static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
{
return do_store(cctx, value, NULL, 0);
}
static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
{
return do_store(cctx, NULL, value, 1);
}
static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
{
return do_store(cctx, value, NULL, 1);
}
static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
{
if (cctx->canames == NULL)
cctx->canames = sk_X509_NAME_new_null();
if (cctx->canames == NULL)
return 0;
return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
}
static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
{
if (cctx->canames == NULL)
cctx->canames = sk_X509_NAME_new_null();
if (cctx->canames == NULL)
return 0;
return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
}
#ifndef OPENSSL_NO_DH
static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
{
int rv = 0;
DH *dh = NULL;
BIO *in = NULL;
if (cctx->ctx || cctx->ssl) {
in = BIO_new(BIO_s_file());
if (in == NULL)
goto end;
if (BIO_read_filename(in, value) <= 0)
goto end;
dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
if (dh == NULL)
goto end;
} else
return 1;
if (cctx->ctx)
rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
if (cctx->ssl)
rv = SSL_set_tmp_dh(cctx->ssl, dh);
end:
DH_free(dh);
BIO_free(in);
return rv > 0;
}
#endif
typedef struct {
int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
const char *str_file;
const char *str_cmdline;
unsigned short flags;
unsigned short value_type;
} ssl_conf_cmd_tbl;
/* Table of supported parameters */
#define SSL_CONF_CMD(name, cmdopt, flags, type) \
{cmd_##name, #name, cmdopt, flags, type}
#define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
#define SSL_CONF_CMD_SWITCH(name, flags) \
{0, NULL, name, flags, SSL_CONF_TYPE_NONE}
/* See apps/apps.h if you change this table. */
static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
SSL_CONF_CMD_SWITCH("no_ssl3", 0),
SSL_CONF_CMD_SWITCH("no_tls1", 0),
SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
SSL_CONF_CMD_SWITCH("bugs", 0),
SSL_CONF_CMD_SWITCH("no_comp", 0),
SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_SWITCH("no_ticket", 0),
SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
SSL_CONF_CMD_SWITCH("strict", 0),
#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
SSL_CONF_CMD_SWITCH("debug_broken_protocol", 0),
#endif
SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
SSL_CONF_CMD_STRING(Curves, "curves", 0),
#ifndef OPENSSL_NO_EC
SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
#endif
SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
SSL_CONF_CMD_STRING(Protocol, NULL, 0),
SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CLIENT),
SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CLIENT),
SSL_CONF_CMD_STRING(Options, NULL, 0),
SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(ServerInfoFile, NULL,
SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_DIR),
SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_DIR),
SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(ClientCAFile, NULL,
SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE),
SSL_CONF_CMD(ClientCAPath, NULL,
SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_DIR),
#ifndef OPENSSL_NO_DH
SSL_CONF_CMD(DHParameters, "dhparam",
SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
SSL_CONF_TYPE_FILE)
#endif
};
/* Supported switches: must match order of switches in ssl_conf_cmds */
static const ssl_switch_tbl ssl_cmd_switches[] = {
{SSL_OP_NO_SSLv3, 0}, /* no_ssl3 */
{SSL_OP_NO_TLSv1, 0}, /* no_tls1 */
{SSL_OP_NO_TLSv1_1, 0}, /* no_tls1_1 */
{SSL_OP_NO_TLSv1_2, 0}, /* no_tls1_2 */
{SSL_OP_ALL, 0}, /* bugs */
{SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
{SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
{SSL_OP_NO_TICKET, 0}, /* no_ticket */
{SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
/* legacy_renegotiation */
{SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
/* legacy_server_connect */
{SSL_OP_LEGACY_SERVER_CONNECT, 0},
/* no_resumption_on_reneg */
{SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
/* no_legacy_server_connect */
{SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
{SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
{SSL_CERT_FLAG_BROKEN_PROTOCOL, SSL_TFLAG_CERT} /* debug_broken_protocol */
#endif
};
static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
{
if (!pcmd || !*pcmd)
return 0;
/* If a prefix is set, check and skip */
if (cctx->prefix) {
if (strlen(*pcmd) <= cctx->prefixlen)
return 0;
if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
return 0;
if (cctx->flags & SSL_CONF_FLAG_FILE &&
strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
return 0;
*pcmd += cctx->prefixlen;
} else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
if (**pcmd != '-' || !(*pcmd)[1])
return 0;
*pcmd += 1;
}
return 1;
}
/* Determine if a command is allowed according to cctx flags */
static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx,
const ssl_conf_cmd_tbl * t)
{
unsigned int tfl = t->flags;
unsigned int cfl = cctx->flags;
if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
return 0;
if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
return 0;
if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
&& !(cfl & SSL_CONF_FLAG_CERTIFICATE))
return 0;
return 1;
}
static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
const char *cmd)
{
const ssl_conf_cmd_tbl *t;
size_t i;
if (cmd == NULL)
return NULL;
/* Look for matching parameter name in table */
for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
if (ssl_conf_cmd_allowed(cctx, t)) {
if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
return t;
}
if (cctx->flags & SSL_CONF_FLAG_FILE) {
if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
return t;
}
}
}
return NULL;
}
static int ctrl_switch_option(SSL_CONF_CTX *cctx,
const ssl_conf_cmd_tbl * cmd)
{
/* Find index of command in table */
size_t idx = cmd - ssl_conf_cmds;
const ssl_switch_tbl *scmd;
/* Sanity check index */
if (idx >= OSSL_NELEM(ssl_cmd_switches))
return 0;
/* Obtain switches entry with same index */
scmd = ssl_cmd_switches + idx;
ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
return 1;
}
int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
{
const ssl_conf_cmd_tbl *runcmd;
if (cmd == NULL) {
SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
return 0;
}
if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
return -2;
runcmd = ssl_conf_cmd_lookup(cctx, cmd);
if (runcmd) {
int rv;
if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
return ctrl_switch_option(cctx, runcmd);
}
if (value == NULL)
return -3;
rv = runcmd->cmd(cctx, value);
if (rv > 0)
return 2;
if (rv == -2)
return -2;
if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
}
return 0;
}
if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
ERR_add_error_data(2, "cmd=", cmd);
}
return -2;
}
int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
{
int rv;
const char *arg = NULL, *argn;
if (pargc && *pargc == 0)
return 0;
if (!pargc || *pargc > 0)
arg = **pargv;
if (arg == NULL)
return 0;
if (!pargc || *pargc > 1)
argn = (*pargv)[1];
else
argn = NULL;
cctx->flags &= ~SSL_CONF_FLAG_FILE;
cctx->flags |= SSL_CONF_FLAG_CMDLINE;
rv = SSL_CONF_cmd(cctx, arg, argn);
if (rv > 0) {
/* Success: update pargc, pargv */
(*pargv) += rv;
if (pargc)
(*pargc) -= rv;
return rv;
}
/* Unknown switch: indicate no arguments processed */
if (rv == -2)
return 0;
/* Some error occurred processing command, return fatal error */
if (rv == 0)
return -1;
return rv;
}
int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
{
if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
const ssl_conf_cmd_tbl *runcmd;
runcmd = ssl_conf_cmd_lookup(cctx, cmd);
if (runcmd)
return runcmd->value_type;
}
return SSL_CONF_TYPE_UNKNOWN;
}
SSL_CONF_CTX *SSL_CONF_CTX_new(void)
{
SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
return ret;
}
int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
{
/* See if any certificates are missing private keys */
size_t i;
CERT *c = NULL;
if (cctx->ctx)
c = cctx->ctx->cert;
else if (cctx->ssl)
c = cctx->ssl->cert;
if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
for (i = 0; i < SSL_PKEY_NUM; i++) {
const char *p = cctx->cert_filename[i];
/*
* If missing private key try to load one from certificate file
*/
if (p && !c->pkeys[i].privatekey) {
if (!cmd_PrivateKey(cctx, p))
return 0;
}
}
}
if (cctx->canames) {
if (cctx->ssl)
SSL_set_client_CA_list(cctx->ssl, cctx->canames);
else if (cctx->ctx)
SSL_CTX_set_client_CA_list(cctx->ctx, cctx->canames);
else
sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
cctx->canames = NULL;
}
return 1;
}
void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
{
if (cctx) {
size_t i;
for (i = 0; i < SSL_PKEY_NUM; i++)
OPENSSL_free(cctx->cert_filename[i]);
OPENSSL_free(cctx->prefix);
sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
OPENSSL_free(cctx);
}
}
unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
{
cctx->flags |= flags;
return cctx->flags;
}
unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
{
cctx->flags &= ~flags;
return cctx->flags;
}
int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
{
char *tmp = NULL;
if (pre) {
tmp = OPENSSL_strdup(pre);
if (tmp == NULL)
return 0;
}
OPENSSL_free(cctx->prefix);
cctx->prefix = tmp;
if (tmp)
cctx->prefixlen = strlen(tmp);
else
cctx->prefixlen = 0;
return 1;
}
void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
{
cctx->ssl = ssl;
cctx->ctx = NULL;
if (ssl) {
cctx->poptions = &ssl->options;
cctx->min_version = &ssl->min_proto_version;
cctx->max_version = &ssl->max_proto_version;
cctx->pcert_flags = &ssl->cert->cert_flags;
cctx->pvfy_flags = &ssl->verify_mode;
} else {
cctx->poptions = NULL;
cctx->min_version = NULL;
cctx->max_version = NULL;
cctx->pcert_flags = NULL;
cctx->pvfy_flags = NULL;
}
}
void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
{
cctx->ctx = ctx;
cctx->ssl = NULL;
if (ctx) {
cctx->poptions = &ctx->options;
cctx->min_version = &ctx->min_proto_version;
cctx->max_version = &ctx->max_proto_version;
cctx->pcert_flags = &ctx->cert->cert_flags;
cctx->pvfy_flags = &ctx->verify_mode;
} else {
cctx->poptions = NULL;
cctx->min_version = NULL;
cctx->max_version = NULL;
cctx->pcert_flags = NULL;
cctx->pvfy_flags = NULL;
}
}
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